package com.hmdp.utils;


import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @projectName: hm-dianping
 * @package: com.hmdp.utils
 * @className: RedisIdWorker
 * @author: Mocrash
 * @description: TODO
 * @date: 2024/9/3 16:09
 * @version: 1.0
 */
@Component
public class RedisIdWorker {

    /*开始时间戳*/
    private static final long BEGIN_TIMESTAMP = 1725380173L;
    /*序列号的位数*/
    private static final int COUNT_BITS = 32;

    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWorker(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate = stringRedisTemplate;
    }
    public long nextId(String keyPrefix){
        //生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond= now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        timestamp = timestamp << COUNT_BITS;
        //生成序列号
        //获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //拼接并返回
        return timestamp | count;
    }

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.now();
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println("second = " + second);
    }
}
